Polishing-wheel.



Nb. 683,|23. Patented Sept. 24', mm. c. A. KNILL. POLISHING WHEEL.

(Apph ton flledspt 8 1900) (No Model.)

CHARLES A. KNILL, OF BELOIT, WISCONSIN.

POLISHING-WHEEL.

SPECIFICATION forming part of Letters Patent No. 683,123, datedSeptember 24 1901.

Application filed September 6, 1900. $erial No. 29,124. (No model.)

To (0Z5 whom it may concern.-

Be it known that I, CHARLES A. KNILL, a citizen of the United States,residing at Beloit, in the county of Rock and State of Wisconsin, haveinvented certain new and useful Improvements in Polishing-Wheels, ofwhich the following is a specification.

This invention relates particularly to polishing-wheels having apneumatic-cushioned peripheral polishing-surface, and has for its objectimprovements in the manner of providing the pneumatic cushion, ofsecuring the same upon the periphery of the wheel, and to features ofconstruction more fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a side View of apolishing-wheel embodying the features of my invention, portions of theperiphery of said wheel being broken away to show its structure. Fig. 2is a side elevation of the metallic body portion of thispolishing-wheel, showing the helical groove in its face for thereception of the pneumatic tube. Fig. 3 shows the body portionrepresented in the preceding figure, with the pneu matic tube lying inthe helical groove formed upon the peripheral face of said body portion.Fig. 4 is a transverse diametric section through the periphery of thispolishing-wheel. Fig. 5 is a face view of the emery band intended toencompass the wheel. Fig. 6 is a fragmental view of the pneumatic tube,showing the tapes in the interior thereof.

Like letters of reference indicate corresponding parts throughout theseveral views.

In the construction of this polishing-wheel I provide the body portionA, formed in this instance of cast-iron, having the hub A, the web A andthe rim A. In the peripheral face of the rim I turn the semicircularhelical groove A at its ends communicating with the inner side of therim by means of the openings A and A extending through they rim atopposite edges thereof. Each edge of the rim A is provided with theannular ring A, secured to said rim by screws A A pneumatic tube 13, inthis instance composed of rubber, lies in the helical groove A", eachend of said tube being provided with an airvalve B, of the usualconstruction, extending through the openings A and A. To prevent theundue stretching and the creep ing of said tube in its helical grooveand to secure the tube in its position upon the face of the wheel A, Iinsert the tape B in said tube throughout the length of the latter andsecure the ends of the tape to the air-valves B. An endless cover 0, ofcanvas or other suitable material, surrounds the wheel, covering andprotecting the air-tube B. The edges of the cover are provided withopenings O for the passage of the screws A by means of which latterpassing through the ring A the canvas cover 0 is secured in its placeupon the wheel. The polishing-band D, an endless ring of fabric treatedwith an abrasive material, is adapted'to be slipped over the canvascover 0 and is held in position upon said cover by the inflation of thetube B. When the tube is deflated, the polishing-band may he slipped offand on with case. When itis inflated, the bandis retained firmly in itsplace at the periphery of the wheel. Access to the tube is had byremoving the ring A' and slipping the canvas cover C from over the tube.In use the cover is put in place and secured in position by the ring Aand the screws A the polishing-band D put in place around the cover 0,and the tube B inflated by means of an air-pump. When it is desirable toremove the polishingband, the tubeB is deflated. It is evident that awire or cordmight be used for the samepurpose as the tape within thetube B or said tube secured to the face of the wheel by cement or othermeans'without departing from the spirit of my invention.

I claim as my invention- 1. In a polishing-wheel, in combination, a bodyportion; an air-tube on the periphery thereof 5 and a tape of a constantlength, fixed at its ends with relation to said body portion, andadapted to engage said tube and hold the same firmly against theperiphery of said body portion.

2. In a polishing-wheel, in combination, a body portion; an air-tubehelically arranged on the face thereof; a tape fixed at its ends withrelation to said body portion, which tape extends through said air-tubeand is of a con stant length just sufficient to encircle the bodyportion thereof and thereby hold said Ice tube firmly against theperiphery thereof; and a polishing-band adapted to lie upon saidair-tube.

3. In a polishing-wheel, in combination, a body portion comprising a rimhaving a he1i cal groove in the peripheral face thereof, and an openingthrough said rim near each end of said groove; an air-tube in saidgroove; a tape fixed at its ends with relation to said I body portion,Which tape extends through said air-tube and is of a length justsufficient l to encircle the body portion and thereby hold said tubefirmly against the periphery thereof; an air-valve for each end of saidair-tube, which valves extend through said openings in said rim; a coverfor said air-tube; and an endless polishing-band.

CHARLES A. KNILL.

\Vitnesses:

E. F. HANSEN, A. F. SPAULDING.

